Note that dio_read on Windows (other platforms unknown) will not timeout if there is no data to read. There is no way to specify a timeout or do a non-blocking read on Windows.
(PHP 4 >= 4.2.0, PHP 5 < 5.1.0)
dio_read — 从文件描述符读取字节
$fd, int $len = 1024): string
dio_read() 函数读取并返回描述符 fd
指定文件中的 len 字节。
从 fd 读取的字节。
Note that dio_read on Windows (other platforms unknown) will not timeout if there is no data to read. There is no way to specify a timeout or do a non-blocking read on Windows.I am using dio functions on windows to read RS232 port.
I can read/write but it seems that the write function cannot be binary.
In particular:
dio_write($com1,chr(10),1); will result in writing 2 bytes 0D 0A be cause \n is translated to \r\n. I have not found any way to overcome this limitation so far